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| type
TIOTreeViewDataProc = procedure(ANode: TTreeNode; AStream: TStream);
PDataNode = ^TDataNode;
TDataNode = record
S: string;
I: Integer;
end;
function StreamWriteString(AStream: TStream; const S: string): Integer;
begin
Result := Length(S);
AStream.Write(Result, SizeOf(Result));
if Result > 0 then
AStream.Write(S[1], Result);
end;
function StreamReadString(AStream: TStream; out S: string): Integer;
begin
AStream.Read(Result, SizeOf(Result));
SetLength(S, Result);
if Result > 0 then
AStream.Read(S[1], Result);
end;
procedure SaveTreeViewDataProc(ANode: TTreeNode; AStream: TStream);
var
DataNode: PDataNode;
I: Integer;
begin
// On peut le faire manuellement pour chaque type de Record
// On peut le faire automatiquement via la lib SEPI SCL
DataNode := PDataNode(ANode.Data);
StreamWriteString(AStream, DataNode^.S);
AStream.Write(DataNode^.I, SizeOf(DataNode^.I));
end;
procedure ReadTreeViewDataProc(ANode: TTreeNode; AStream: TStream);
var
DataNode: PDataNode;
begin
// On peut le faire manuellement pour chaque type de Record
// On peut le faire automatiquement via la lib SEPI SCL
New(DataNode);
StreamReadString(AStream, DataNode^.S);
AStream.Read(DataNode^.I, SizeOf(DataNode^.I));
ANode.Data := DataNode;
end;
procedure TFrmTestDivers.FreeDataNodes();
var
Node: TTreeNode;
begin
Node := TreeView.Items.GetFirstNode();
while Assigned(Node) do
begin
if Assigned(Node.Data) then
Dispose(PDataNode(Node.Data));
Node := Node.GetNext();
end;
end;
procedure TFrmTestDivers.BtnFillDataClick(Sender: TObject);
var
Node: TTreeNode;
DataNode: PDataNode;
I: Integer;
begin
I := 0;
Node := TreeView.Items.GetFirstNode();
while Assigned(Node) do
begin
if not Assigned(Node.Data) then
begin
New(DataNode);
DataNode^.S := UpperCase(Node.Text);
DataNode^.I := I;
Node.Data := DataNode;
Inc(I);
end;
Node := Node.GetNext();
end;
end;
procedure TreeViewDataSaveToStream(ATree: TTreeView; AStream: TStream; SaveDataProc: TIOTreeViewDataProc);
var
DataStream, NodeStream: TMemoryStream;
DataSize, NodeSize: Integer;
Node: TTreeNode;
begin
if Assigned(ATree) and Assigned(AStream) then
begin
DataStream := TMemoryStream.Create();
try
Node := ATree.Items.GetFirstNode();
while Assigned(Node) do
begin
SaveDataProc(Node, DataStream);
Node := Node.GetNext();
end;
AStream.Size := 0;
DataStream.Seek(0, soFromBeginning);
DataSize := DataStream.Size;
AStream.Write(DataSize, SizeOf(DataSize));
AStream.CopyFrom(DataStream, DataSize);
NodeStream := TMemoryStream.Create();
try
NodeStream.WriteComponent(ATree);
NodeStream.Seek(0, soFromBeginning);
NodeSize := NodeStream.Size;
AStream.Write(NodeSize, SizeOf(NodeSize));
AStream.CopyFrom(NodeStream, NodeSize);
finally
NodeStream.Free();
end;
finally
DataStream.Free();
end;
end;
end;
procedure TreeViewDataLoadFromStream(ATree: TTreeView; AStream: TStream; ReadDataProc: TIOTreeViewDataProc);
var
Owner: TWinControl;
MemoryTree: TTreeView;
DataStream, NodeStream: TMemoryStream;
DataSize, NodeSize: Integer;
Node: TTreeNode;
begin
if Assigned(ATree) and Assigned(AStream) then
begin
AStream.Seek(0, soFromBeginning);
AStream.Read(DataSize, SizeOf(DataSize));
DataStream := TMemoryStream.Create();
try
DataStream.CopyFrom(AStream, DataSize);
NodeStream := TMemoryStream.Create();
try
AStream.Read(NodeSize, SizeOf(NodeSize));
NodeStream.CopyFrom(AStream, NodeSize);
NodeStream.Seek(0, soFromBeginning);
MemoryTree := TTreeView.Create(nil);
try
MemoryTree.Parent := ATree;
NodeStream.ReadComponent(MemoryTree);
DataStream.Seek(0, soFromBeginning);
Node := MemoryTree.Items.GetFirstNode();
while Assigned(Node) do
begin
ReadDataProc(Node, DataStream);
Node := Node.GetNext();
end;
ATree.Items.Assign(MemoryTree.Items);
finally
MemoryTree.Free();
end;
finally
NodeStream.Free();
end;
finally
DataStream.Free();
end;
end;
end;
procedure TFrmTestDivers.BtnShowDataClick(Sender: TObject);
var
Node: TTreeNode;
DataNode: PDataNode;
begin
Node := TreeView.Items.GetFirstNode();
while Assigned(Node) do
begin
if Assigned(Node.Data) then
begin
DataNode := PDataNode(Node.Data);
Node.Text := Format('Text : "%s", Data : "%s-%d"', [Node.Text, DataNode^.S, DataNode^.I]);
end;
Node := Node.GetNext();
end;
end;
procedure TFrmTestDivers.BtnSaveTreeDataClick(Sender: TObject);
var
FileStream: TFileStream;
begin
FileStream := TFileStream.Create(ExtractFilePath(Application.ExeName) + 'Files\' + ExtractFileName(ChangeFileExt(Application.ExeName, '.Tree.Dat')), fmCreate);
try
TreeViewDataSaveToStream(TreeView, FileStream, SaveTreeViewDataProc);
finally
FileStream.Free();
end;
end;
procedure TFrmTestDivers.BtnLoadTreeDataClick(Sender: TObject);
var
FileStream: TFileStream;
begin
FileStream := TFileStream.Create(ExtractFilePath(Application.ExeName) + 'Files\' + ExtractFileName(ChangeFileExt(Application.ExeName, '.Tree.Dat')), fmOpenRead);
try
TreeViewDataLoadFromStream(TreeView, FileStream, ReadTreeViewDataProc);
finally
FileStream.Free();
end;
end; |
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